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The MX lookup is done directly against the domain's authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance.
All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information. And you'll have a chronological history of your results.
The Domain Health Check will execute hundreds of domain/email/network performance tests to make sure all of your systems are online and performing optimally. The report will then return results for your domain and highlight critical problem areas for your domain that need to be resolved.
Create or edit DMARC/DKIM/SPF records, validate that all DNS records critical to email delivery are correct, test IPs/domains/hostnames for blacklist/reputation problems, analyze email headers to uncover email delivery delays/issues, and much more with these tools.
The blacklist check will test a mail server IP address against over 100 DNS based email blacklists. (Commonly called Realtime blacklist, DNSBL or RBL). If your mail server has been blacklisted, some email you send may not be delivered. Email blacklists are a common way of reducing spam.
The DKIM Check tool will perform a DKIM record test against a domain name and selector for a valid published DKIM key record. DomainKeys Identified Mail (DKIM) defines a domain-level digital signature authentication framework for email by permitting a signing domain to assert responsibility for a message in transit.
This lookup will list DNS Text (TXT) records for a domain. The DNS lookup is done directly against the domain's authoritative name servers, so changes to DNS TXT Records should show up instantly.
We invite you to explore our knowledge base of blacklist, email, network, and dns problems reported by MxToolbox's set of free tools. You can also learn more about how diagnosing and monitoring these problems can keep nasty surprises from happening to your email, network, or dns.
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